bl1-smc-handler: Ensure the lower-order 16 bits of SPSR are programmed

A bug recently fixed in bl2/aarch32/bl2_el3_entrypoint.S relates to
programming the lower-order 16 bits of the SPSR to populate into the CPSR
on eret.

The BL1 smc-handler code is identical and has the same shortfall in
programming the SPSR from the platform defined struct
entry_point_info->spsr.

msr spsr, r1 will only update bits f->[31:24] and c->[7:0] respectively. In
order to ensure the 16 lower-order processor mode bits x->[15:8] and
c->[7:0] this patch changes msr spsr, r1 to msr spsr_xc, r1.

This change ensures we capture the x field, which we are interested in and
not the f field which we are not.

Fixes: f3b4914b

 ('AArch32: Add generic changes in BL1')
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

bl1/aarch32/bl1_exceptions.S

@@ -71,7 +71,7 @@ debug_loop:
 	 */
 	ldr	lr, [r8, #ENTRY_POINT_INFO_PC_OFFSET]
 	ldr	r1, [r8, #(ENTRY_POINT_INFO_PC_OFFSET + 4)]
-	msr	spsr, r1
+	msr	spsr_xc, r1
 
 	/* Some BL32 stages expect lr_svc to provide the BL33 entry address */
 	cps	#MODE32_svc