microblaze: Remove zalloc_maybe_bootmem()

Last user of zalloc_maybe_bootmem() was removed by
commit 4308e3c9 ("microblaze/PCI: Remove unused allocation & free
of PCI host bridge structure")

Remove it.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/bfb1601cac24d7ef8e741c83f9301e4a5a87a0b5.1692124505.git.christophe.leroy@csgroup.euSigned-off-by: Michal Simek <michal.simek@amd.com>

arch/microblaze/include/asm/setup.h

@@ -25,7 +25,5 @@ void machine_shutdown(void);
 void machine_halt(void);
 void machine_power_off(void);
 
-extern void *zalloc_maybe_bootmem(size_t size, gfp_t mask);
-
 # endif /* __ASSEMBLY__ */
 #endif /* _ASM_MICROBLAZE_SETUP_H */

arch/microblaze/mm/init.c

@@ -270,22 +270,6 @@ asmlinkage void __init mmu_init(void)
 	memblock_dump_all();
 }
 
-void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
-{
-	void *p;
-
-	if (mem_init_done) {
-		p = kzalloc(size, mask);
-	} else {
-		p = memblock_alloc(size, SMP_CACHE_BYTES);
-		if (!p)
-			panic("%s: Failed to allocate %zu bytes\n",
-			      __func__, size);
-	}
-
-	return p;
-}
-
 static const pgprot_t protection_map[16] = {
 	[VM_NONE]					= PAGE_NONE,
 	[VM_READ]					= PAGE_READONLY_X,