armv8: minor fix to comment for enabling SMPEN bit

The SMPEN bit is located in the cpuectlr_el1 register and not the
cpuactlr_el1 register. Adjust the comment accordingly and also fix
a spelling error.

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
CC: Mingkai Hu <mingkai.hu@nxp.com>
CC: Gong Qianyu <Qianyu.Gong@nxp.com>
CC: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
CC: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
CC: York Sun <york.sun@nxp.com>
CC: Albert Aribaud <albert.u.boot@aribaud.net>
CC: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: York Sun <york.sun@nxp.com>

arch/arm/cpu/armv8/start.S

@@ -86,12 +86,12 @@ save_boot_params_ret:
 0:
 
 	/*
-	 * Enalbe SMPEN bit for coherency.
+	 * Enable SMPEN bit for coherency.
 	 * This register is not architectural but at the moment
 	 * this bit should be set for A53/A57/A72.
 	 */
 #ifdef CONFIG_ARMV8_SET_SMPEN
-	mrs     x0, S3_1_c15_c2_1               /* cpuactlr_el1 */
+	mrs     x0, S3_1_c15_c2_1               /* cpuectlr_el1 */
 	orr     x0, x0, #0x40
 	msr     S3_1_c15_c2_1, x0
 #endif