Implement slbia as a dTLB/iTLB flush

Implement slbia as a dTLB/iTLB flush

Slbia (with IH=7) is used in the Linux kernel to flush the ERATs
(our iTLB/dTLB), so make it do that.

This moves the logic to work out whether to flush a single entry
or the whole TLB from dcache and icache into mmu.  We now invalidate
all dTLB and iTLB entries when the AP (actual pagesize) field of
RB is non-zero on a tlbie[l], as well as when IS is non-zero.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>