board/freescale: imx9-bootloader-prepare.sh: fix cpu name

This commit replaces "a35" occurrences with "a55" in imx9 bootloader
preparation script. i.MX9 families have Cortex-A55 processors. See [1].

This change is purely cosmetic and only for correctness, as the
mkimage_imx8 tool currently uses internally the "a55" identifier as
an alias for "a35". See [2].

[1] https://www.nxp.com/products/processors-and-microcontrollers/arm-processors/i-mx-applications-processors/i-mx-9-processors:IMX9-PROCESSORS
[2] https://github.com/nxp-imx/imx-mkimage/blob/lf-6.6.23-2.0.0/src/mkimage_imx8.c#L773

Signed-off-by: Juan Pablo MONTERO CASTRO <juanpablo.monterocastro@nxp.com>
[Julien: reword a bit and add info in commit log]
Signed-off-by: Julien Olivain <ju.o@free.fr>

board/freescale/common/imx/imx9-bootloader-prepare.sh

@@ -18,19 +18,19 @@ main ()
 
 	if grep -Eq "^BR2_TARGET_OPTEE_OS=y$" "${BR2_CONFIG}"; then
 		"${HOST_DIR}/bin/mkimage_imx8" -soc IMX9 -c \
-			-ap "${BINARIES_DIR}/bl31.bin" a35 ${ATF_LOAD_ADDR} \
-			-ap "${BINARIES_DIR}/u-boot-hash.bin" a35 0x80200000 \
-			-ap "${BINARIES_DIR}/tee.bin" a35 0x96000000 \
+			-ap "${BINARIES_DIR}/bl31.bin" a55 ${ATF_LOAD_ADDR} \
+			-ap "${BINARIES_DIR}/u-boot-hash.bin" a55 0x80200000 \
+			-ap "${BINARIES_DIR}/tee.bin" a55 0x96000000 \
 			-out "${BINARIES_DIR}/u-boot-atf-container.img"
 	else
 		"${HOST_DIR}/bin/mkimage_imx8" -soc IMX9 -c \
-			-ap "${BINARIES_DIR}/bl31.bin" a35 ${ATF_LOAD_ADDR} \
-			-ap "${BINARIES_DIR}/u-boot-hash.bin" a35 0x80200000 \
+			-ap "${BINARIES_DIR}/bl31.bin" a55 ${ATF_LOAD_ADDR} \
+			-ap "${BINARIES_DIR}/u-boot-hash.bin" a55 0x80200000 \
 			-out "${BINARIES_DIR}/u-boot-atf-container.img"
 	fi
 
 	"${HOST_DIR}/bin/mkimage_imx8" -soc IMX9 -append "${BINARIES_DIR}/ahab-container.img" -c \
-		-ap "${BINARIES_DIR}/u-boot-spl-ddr.bin" a35 ${SPL_LOAD_ADDR} \
+		-ap "${BINARIES_DIR}/u-boot-spl-ddr.bin" a55 ${SPL_LOAD_ADDR} \
 		-out "${BINARIES_DIR}/imx9-boot-sd.bin"
 
 	flashbin_size="$(wc -c "${BINARIES_DIR}/imx9-boot-sd.bin" | awk '{print $1}')"