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[mips] revert r366664 - flip mips back from -O2 to -O

Description

[mips] revert r366664 - flip mips back from -O2 to -O

Now that I have -head fitting in 8MB of flash again, I can test
out freebsd-head on my home AP test setup. Unfortunately,
the introduction of -O2 in r366664 causes the following infinite
loop shortly after boot:


MAP: No valid partition found at map/rootfs.uzip
Warning: no time-of-day clock registered, system time will not be set accurately
start_init: trying /sbin/init
BAD_PAGE_FAULT: pid 1 tid 100001 (init), uid 0: pc 0x4042c320 got a read fault (type 0x2) at 0x2e3a0
Trapframe Register Dump:

zero: 0 at: 0   v0: 0   v1: 0
a0: 0x1af34     a1: 0   a2: 0   a3: 0x7fffeff0
t0: 0   t1: 0   t2: 0   t3: 0
t4: 0   t5: 0   t6: 0   t7: 0
t8: 0   t9: 0x152e8     s0: 0x7fffee84  s1: 0
s2: 0   s3: 0   s4: 0   s5: 0
s6: 0   s7: 0   k0: 0   k1: 0
gp: 0x362c0     sp: 0x7fffedf0  s8: 0   ra: 0x40417df0
sr: 0xf413      mullo: 0        mulhi: 0        badvaddr: 0x2e3a0
cause: 0xffffffff80000008       pc: 0x4042c31c

Page table info for pc address 0x4042c320: pde = 0x80712000, pte = 0xa002065a
Dumping 4 words starting at pc address 0x4042c320:
8f9980e0 80820000 10400067 00809825
Page table info for bad address 0x2e3a0: pde = 0, pte = 0


I'm not yet sure why, but until I figure it out with the mips64/cheri
folk this should be reverted.

This should only use -O on GCC generated code for MIPS platforms.

Tested:

  • QCA934x (mips74k) - WDR-3600/WDR-4300 APs

Differential Revision: https://reviews.freebsd.org/D28122