u-boot: Explicit specify the branch name

Daisy branch for YOCTO poky expect to specify the branch for
SRC_URI. Otherwise bitbake will report an fetcher failure: "Unable
to find revision X in branch master even from upstream"

Signed-off-by: Daniel Dragomir <daniel.dragomir@windriver.com>
lsi-image-large: Adapt some packages to match with daisy branch

Some packages and subpackages are changed in upstream (poky) for daisy branch.
Need to adapt our lsi-image-large conf file to match.

Signed-off-by: Daniel Dragomir <daniel.dragomir@windriver.com>
cortex-a15: Add hard float support (VFPv4)

Set cortexa15hf-neon-vfpv4 as DEFAULTTUNE for axxiarm machine and
add tuning options for Cortex-A15 with FPv4:
- cortexa15hf-neon-vfpv4
- cortexa15thf-neon-vfpv4

Signed-off-by: Daniel Dragomir <daniel.dragomir@windriver.com>
cortex-a15: Remove '-march=armv7-a' from TUNE_CCARGS

Since '-march=armv7-a' conflicts with '-mcpu=cortex-a15', remove it
from TUNE_CCARGS.

Signed-off-by: Daniel Dragomir <daniel.dragomir@windriver.com>