msm: memutils: 8974: memcpy, memmove optimization

According to tune result, change preload distance to 10
cache lines for 8974.
And considering bkk-b is sharing code for 8974, 8226, 8x16,
we seperate the code for 8974 specially.

The markable improvement:
    memcpy : 67%
    copy_to_user : 37%
    copy_from_user : 37%
    memmove : 70%

Raw data is as below:

BEFORE:
	memcpy 1000MB at 5MB       : took 659744 usec, bandwidth 1515.515 MB/s
	copy_to_user 1000MB at 5MB : took 681202 usec, bandwidth 1467.467 MB/s
	copy_from_user 1000MB at 5M: took 682052 usec, bandwidth 1466.466 MB/s
	memmove 1000GB at 5MB      : took 763133 usec, bandwidth 1310.310 MB/s
	copy_to_user 1000GB at 4kB : took 714487 usec, bandwidth 1399.399 MB/s
	copy_from_user 1000GB at 4k: took 699861 usec, bandwidth 1428.428 MB/s
	copy_page 1000GB at 4kB    : took 634857 usec, bandwidth 1575.575 MB/s
	memmove 1000GB at 4kB      : took 791389 usec, bandwidth 1263.263 MB/s
	memcpy 1000MB at 5MB       : took 659744 usec, bandwidth 1515.515 MB/s

AFTER:
	memcpy 1000MB at 5MB       : took 395178 usec, bandwidth 2530.530 MB/s
	copy_to_user 1000MB at 5MB : took 497667 usec, bandwidth 2009.009 MB/s
	copy_from_user 1000MB at 5M: took 496832 usec, bandwidth 2012.012 MB/s
	memmove 1000GB at 5MB      : took 449217 usec, bandwidth 2226.226 MB/s
	copy_to_user 1000GB at 4kB : took 489006 usec, bandwidth 2044.044 MB/s
	copy_from_user 1000GB at 4k: took 483982 usec, bandwidth 2066.066 MB/s
	copy_page 1000GB at 4kB    : took 377170 usec, bandwidth 2651.651 MB/s
	memmove 1000GB at 4kB      : took 483015 usec, bandwidth 2070.070 MB/s

Change-Id: I678d418b15701efea902efae9b94490993d53f37
Signed-off-by: Hong-Mei Li <a21834@motorola.com>
Reviewed-on: http://gerrit.mot.com/634422
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
SLTApproved: Christopher Fries <c.fries@motorola.com>
Reviewed-by: John Zafiris <johnz@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Signed-off-by: Jake Weinstein <xboxlover360@gmail.com>
Apply arch: arm: lib: optimize memcpy for cortex-A15 to copy_template_8974.S
hells_defconfig: hC-b4.2-L