ARM: PSCI: Make psci_get_cpu_stack_top local to armv7/psci.S

Now that we have a secure data section for storing variables, there
should be no need for platform code to get the stack address.

Make psci_get_cpu_stack_top a local function, as it should only be
used in armv7/psci.S and only by psci_stack_setup.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>

arch/arm/cpu/armv7/psci.S

@@ -213,7 +213,7 @@ ENDPROC(psci_cpu_off_common)
 @ --------------------  __secure_stack_start
 @
 @ This expects CPU ID in r0 and returns stack top in r0
-ENTRY(psci_get_cpu_stack_top)
+LENTRY(psci_get_cpu_stack_top)
 	@ stack top = __secure_stack_end - (cpuid << ARM_PSCI_STACK_SHIFT)
 	ldr	r3, =__secure_stack_end
 	sub	r0, r3, r0, LSL #ARM_PSCI_STACK_SHIFT

arch/arm/include/asm/psci.h

@@ -60,7 +60,6 @@ void psci_save_target_pc(int cpu, u32 pc);
 
 void psci_cpu_entry(void);
 u32 psci_get_cpu_id(void);
-u32 psci_get_cpu_stack_top(int cpu);
 void psci_cpu_off_common(void);
 
 int psci_update_dt(void *fdt);