kselftests/arm64: add BTI J test

BTI-J functionality test checks for non function call like case statement.
BTI-J supports 0b11 and 0b01 PSTATE.BTYPE with BTYPE=0b11 BR, BRAA,
BRAB, BRAAZ, BRABZ with any register other than X16 or X17 and with
BTYPE=0b01 BR, BRAA, BRAB, BRAAZ, BRABZ with X16 or X17 branch
instruction.

Executing any other type of branch instruction in this case including
direct branches sets BTYPE to 0b00. Then processor checks whether
the instruction being targeted is a landing. If it is not a landing
or wrong type of indirect branch then exception is generated.

Co-Developed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Vikas Kumar <vikas.kumar2@arm.com>