xtensa: xt2000: drop redundant sysmem initialization

sysmem structure initialization in xt2000 platform_init is identical to
the one done in init_arch just before the call to platform_init.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/platforms/xt2000/setup.c

@@ -92,18 +92,8 @@ void __init platform_setup(char** cmdline)
 
 /* early initialization */
 
-extern sysmem_info_t __initdata sysmem;
-
-void platform_init(bp_tag_t* first)
+void __init platform_init(bp_tag_t *first)
 {
-	/* Set default memory block if not provided by the bootloader. */
-
-	if (sysmem.nr_banks == 0) {
-		sysmem.nr_banks = 1;
-		sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
-		sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
-				     + PLATFORM_DEFAULT_MEM_SIZE;
-	}
 }
 
 /* Heartbeat. Let the LED blink. */