uboot: build with -O2 on all architectures
The -Os option was disabled due to a bug in gcc building bad binaries for ARM
in an earlier commit:
f2dc7fadd8c6b180c3f985873261216d53f47f0d
This caused problems for powerpc which was resolved by replacing -Os with
-O2 for that architecture:
d0eb6794d964aa5ac938533a222c39bef09fd945
Using -O2 also works for ARM, so there is no need to condition using -O2 on
powerpc. Remove the condition and use -O2 on all architectures.
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
CC: Ilya Yanok <yanok@emcraft.com>
CC: Richard Purdie <richard.purdie@linuxfoundation.org>
