powerpc: Remove warm reset entry point

No boards utilize the warm reset entry point, so remove it.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/arch/powerpc/cpu/mpc5xx/start.S b/arch/powerpc/cpu/mpc5xx/start.S
index 0af879e..4fd9b63 100644
--- a/arch/powerpc/cpu/mpc5xx/start.S
+++ b/arch/powerpc/cpu/mpc5xx/start.S
@@ -91,18 +91,6 @@
 	li	r4, CONFIG_SYS_ISB			/* Set ISB bit */
 	or	r3, r3, r4
 	mtspr	638, r3
-	li	r21, BOOTFLAG_COLD		/* Normal Power-On: Boot from FLASH	*/
-	b	boot_cold
-
-	. = EXC_OFF_SYS_RESET + 0x20
-
-	.globl	_start_warm
-_start_warm:
-	li	r21, BOOTFLAG_WARM		/* Software reboot */
-	b	boot_warm
-
-boot_cold:
-boot_warm:
 
 	/* Initialize machine status; enable machine check interrupt		*/
 	/*----------------------------------------------------------------------*/
@@ -188,10 +176,10 @@
 	/* r3: IMMR */
 	bl	cpu_init_f	/* run low-level CPU init code     (from Flash)	*/
 
-	mr	r3, r21
-	/* r3: BOOTFLAG */
 	bl	board_init_f	/* run 1st part of board init code (from Flash) */
 
+	/* NOTREACHED - board_init_f() does not return */
+
 
 	.globl	_start_of_vectors
 _start_of_vectors: