powerpc/boot: Fix crt0.S current address branch form

Use the preferred form of branch-and-link for finding the current
address so objtool doesn't think it is an unannotated intra-function
call.

Signed-off-by: Nicholas Piggin <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://msgid.link/[e-mail]

arch/powerpc/boot/crt0.S

···
 _zimage_start_lib:
 	/* Work out the offset between the address we were linked at
 	   and the address where we're running. */
-	bl	.+4
+	bcl	20,31,.+4
 p_base:	mflr	r10		/* r10 now points to runtime addr of p_base */
 #ifndef __powerpc64__
 	/* grab the link address of the dynamic section in r11 */
···
 	mtsrr1	r10
 
 	/* Load FW address, set LR to label 1, and jump to FW */
-	bl	0f
+	bcl	20,31,0f
 0:	mflr	r10
 	addi	r11,r10,(1f-0b)
 	mtlr	r11