[patch] refactor arm-tdep.c:install_ldr_str_ldrb_strb to handle halfword

[Yao Qi]

When writing install_ldr_str_ldrb_strb, I didn't realize there are
halfword load/store instructions in thumb-2.  This patch is to rename
install_ldr_str_ldrb_strb to install_load_store, and replace parameter
BYTE with SIZE, to handle halfword load/store in the future.

There is no functionality change in this patch, and bits in this patch
will be used in my thumb-2 displaced stepping patch later.

OK for mainline?

-- 
Yao (齐尧)
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