build: Remove unused qcom CFLAG

Change-Id: I6ead3e57899bcb007d4d284901f918a65a9e6926
Enabling sdiv support in ART

Added more target into ART instruction set feature look-up list

Change-Id: I0ea0097181e5c76507b8ca2a34cf37d2e2ca6403
Allow override of kernel defconfig

Change-Id: I3ba3131016aacbdb1f83565a6083720955440d0a