onenand: Remove ONENAND_BOOT option

The option ONENAND_BOOT is never set, so remove it. The option
SYS_ONENAND_BOOT was never migrated to Kconfig and any platforms which
supported that have long been removed from the code, so remove the
reference there as well.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-omap2/omap3/lowlevel_init.S b/arch/arm/mach-omap2/omap3/lowlevel_init.S
index 1ab9472..5541a47 100644
--- a/arch/arm/mach-omap2/omap3/lowlevel_init.S
+++ b/arch/arm/mach-omap2/omap3/lowlevel_init.S
@@ -176,10 +176,10 @@
 	ldr	sp, SRAM_STACK
 	str	ip, [sp]	/* stash ip register */
 	mov	ip, lr		/* save link reg across call */
-#if !defined(CONFIG_SYS_NAND_BOOT) && !defined(CONFIG_SYS_ONENAND_BOOT)
+#if !defined(CONFIG_SYS_NAND_BOOT)
 /*
  * No need to copy/exec the clock code - DPLL adjust already done
- * in NAND/oneNAND Boot.
+ * in NAND Boot.
  */
 	ldr	r1, =SRAM_CLK_CODE
 	bl	cpy_clk_code