main/linux-vanilla: aarch64 serial config improvement

serial_of_platform=y. this improves console=ttyS0 handling
on certain boards.

main/linux-vanilla/APKBUILD

@@ -163,19 +163,19 @@ dev() {
 }
 
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 12786f8aef0ad2f87cbf95a68f34cb56  patch-4.4.15.xz"
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main/linux-vanilla/config-vanilla.aarch64

@@ -2990,7 +2990,7 @@ CONFIG_SERIAL_CORE=y
 CONFIG_SERIAL_CORE_CONSOLE=y
 CONFIG_SERIAL_JSM=m
 # CONFIG_SERIAL_MSM is not set
-CONFIG_SERIAL_OF_PLATFORM=m
+CONFIG_SERIAL_OF_PLATFORM=y
 # CONFIG_SERIAL_SCCNXP is not set
 # CONFIG_SERIAL_SC16IS7XX is not set
 CONFIG_SERIAL_ALTERA_JTAGUART=m