lttng-modules: update to 2.4.1-stable latest

The 3.15, and 3.14.5+ kernels introduced a change to trace_block_rq_complete,
which triggers the following build error:

    probes/../instrumentation/events/lttng-module/../../../probes/lttng-events.h:151:6:
    error: conflicting types for 'trace_block_rq_complete'
    |  void trace_##_name(_proto);
    |       ^
    |
    probes/../instrumentation/events/lttng-module/../../../probes/lttng-events.h:117:2:
    note: in expansion of macro 'DEFINE_EVENT_MAP'
    |   DEFINE_EVENT_MAP(template, name, name, PARAMS(proto), PARAMS(args))
    |   ^
    |
    probes/../instrumentation/events/lttng-module/../../../probes/../instrumentation/events/lttng-module/block.h:235:1:
    note: in expansion of macro 'DEFINE_EVENT'
    |  DEFINE_EVENT(block_rq_with_error, block_rq_complete,

The lttng 2.4.x-stable branch contains the fix (and several other small fixes), so
we bump the SRCREV to import the change.

Build tested against 3.14 and 3.10.

[YOCTO #6459]

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
kernel-module-split: Fix KERNEL_MODULE_AUTOLOAD handling

Addresses the problem:

The stack trace of python calls that resulted in this exception/failure was:
File: 'split_kernel_module_packages', lineno: 164, function: <module>
     0160:        if len(os.listdir(dir)) == 0:
     0161:            os.rmdir(dir)
     0162:
     0163:
 *** 0164:split_kernel_module_packages(d)
     0165:
File: 'split_kernel_module_packages', lineno: 150, function: split_kernel_module_packages
     0146:     0147:    postinst = d.getVar('pkg_postinst_modules', True)
     0148:    postrm = d.getVar('pkg_postrm_modules', True)
     0149:
 *** 0150:    modules = do_split_packages(d, root='/lib/modules', file_regex=module_regex, output_pattern=module_pattern, description='%s kernel module', postinst=postinst, postrm=postrm, recursive=True, hook=frob_metadata, extra_depends='kernel-%s' % (d.getVar("KERNEL_VERSION", True)))
     0151:    if modules:
     0152:        metapkg = d.getVar('KERNEL_MODULES_META_PACKAGE', True)
     0153:        d.appendVar('RDEPENDS_' + metapkg, ' '+' '.join(modules))
     0154:
File: 'package.bbclass', lineno: 148, function: do_split_packages
     0144:                d.setVar('pkg_postrm_' + pkg, postrm)
     0145:        else:
     0146:            d.setVar('FILES_' + pkg, oldfiles + " " + newfile)
     0147:        if callable(hook):
 *** 0148:            hook(f, pkg, file_regex, output_pattern, m.group(1))
     0149:
     0150:    d.setVar('PACKAGES', ' '.join(packages))
     0151:    return split_packages
     0152:
File: 'split_kernel_module_packages', lineno: 109, function: frob_metadata
File "split_kernel_module_packages", line 109, in frob_metadata

Exception: AttributeError: 'NoneType' object has no attribute 'split'

ERROR: Function failed: split_kernel_module_packages

[YOCTO #6461]

[a revised version of a patch from Nitin Kamble]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>