ARM: vexpress_*_defconfig: replace earlyprintk with earlycon

earlyprintk no longer works on arm64 platforms. Replace it with earlycon
which works fine.

Cc: Ryan Harkin <ryan.harkin@linaro.org>
Cc: Liviu Dudau <liviu.dudau@foss.arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/configs/vexpress_aemv8a_semi_defconfig b/configs/vexpress_aemv8a_semi_defconfig
index bff52f7..db5ad3d 100644
--- a/configs/vexpress_aemv8a_semi_defconfig
+++ b/configs/vexpress_aemv8a_semi_defconfig
@@ -7,7 +7,7 @@
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_BOOTDELAY=1
 CONFIG_USE_BOOTARGS=y
-CONFIG_BOOTARGS="console=ttyAMA0 earlyprintk=pl011,0x1c090000 debug user_debug=31 loglevel=9"
+CONFIG_BOOTARGS="console=ttyAMA0 earlycon=pl011,0x1c090000 debug user_debug=31 loglevel=9"
 # CONFIG_USE_BOOTCOMMAND is not set
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set