arm64: el2_setup.h: Rename some labels to be more diff-friendly

arm64: el2_setup.h: Rename some labels to be more diff-friendly

A minor anti-pattern has established itself in __init_el2_fgt,
where each block of instructions is skipped by jumping to a label
named for the next (typically unrelated) block.

This makes diffs more noisy than necessary, since appending each
new block to deal with some new architecture feature now requires
altering a branch destination in the existing code.

Fix it by naming the affected labels based on the block that is
skipping itself instead, as is done elsewhere in the el2_setup code.

No functional change.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Link: https://lore.kernel.org/r/20240729162542.367059-1-Dave.Martin@arm.com
Signed-off-by: Will Deacon <will@kernel.org>