net: wireless: bcmdhd: fix module for GNote 10.1

Strip out the debug symbols (else it's too big) and turn on
"-fno-pic" (preventing "Unknown symbol _GLOBAL_OFFSET_TABLE_")
Fix some -Werror/-Wall compilation warnings/errors for GCC 4.7

These likely popped up once I'd turned off a number of DEBUGs in
the p4notepq_00_defconfig
ARM: turn on some optimizations

WIP, some might not be necessary or useful. Will have to benchmark.
arm: p4notepq_00_defconfig: turn off unnecessary debug options