powerpc: Fix 'intra_function_call not a direct call' warning

The following build warning have been reported:

  arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0xe84: intra_function_call not a direct call
  arch/powerpc/kernel/switch.o: warning: objtool: .text+0x4: intra_function_call not a direct call

This happens due to commit bb7f054 ("objtool/powerpc: Add support
for decoding all types of uncond branches") because that commit decodes
'bl .+4' as a normal instruction because that instruction is used by
clang instead of 'bcl 20,31,+.4' for relocatable code.

The solution is simply to remove the ANNOTATE_INTRA_FUNCTION_CALL
annotation now that the instruction is not seen as a function call
anymore.

Reported-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Closes: https://lore.kernel.org/all/8c4c3fc2-2bd7-4148-af68-2f504d6119e0@linux.ibm.com
Fixes: bb7f054 ("objtool/powerpc: Add support for decoding all types of uncond branches")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Tested-By: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Reviewed-by: Sathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/88876fb4e412203452e57d1037a1341cf15ccc7b.1741128981.git.christophe.leroy@csgroup.eu

arch/powerpc/kernel/switch.S

@@ -39,7 +39,6 @@ flush_branch_caches:
 
 	// Flush the link stack
 	.rept 64
-	ANNOTATE_INTRA_FUNCTION_CALL
 	bl	.+4
 	.endr
 	b	1f

arch/powerpc/kvm/book3s_hv_rmhandlers.S

@@ -1524,14 +1524,12 @@ kvm_flush_link_stack:
 
 	/* Flush the link stack. On Power8 it's up to 32 entries in size. */
 	.rept 32
-	ANNOTATE_INTRA_FUNCTION_CALL
 	bl	.+4
 	.endr
 
 	/* And on Power9 it's up to 64. */
 BEGIN_FTR_SECTION
 	.rept 32
-	ANNOTATE_INTRA_FUNCTION_CALL
 	bl	.+4
 	.endr
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)