[PATCH, GCC, AArch64] Fix a couple of bugs in BTI

[Sudakshina Das]

Hi

While doing more testing I found a couple of issues with my BTI patches. 
This patch fixes them:
1) Remove a reference to return address key. The original patch was 
written based on a different not yet committed patch ([PATCH 
3/3][GCC][AARCH64] Add support for pointer authentication B key) and I 
missed out on cleaning this up. This is hidden behind the configuration 
option and thus went unnoticed.
2) Add a missed case for adding the BTI instruction in thunk functions.

Bootstrapped on aarch64-none-linux-gnu and regression tested on 
aarch64-none-elf with configuration turned on.

gcc/ChangeLog:

2019-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* config/aarch64/aarch64.c (aarch64_output_mi_thunk): Add bti
	instruction if enabled.
	(aarch64_override_options): Remove reference to return address
	key.


Is this ok for trunk?
Sudi
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