arm64: bullhead_defconfig: Unsetting DEVPORT from bullhead configurations.

/dev/port is not used as shown by previous SELinux policy changes to
blacklist it. It is being unset to reduce kernel size and attack
surface, mirroring the same chagnes done to DEVMEM and DEVKMEM.

Bug: 36604779
Change-Id: I0a9e26fa3f234fd94a6d0521bc7edc7d5a84f4f6
Signed-off-by: Max Bires <jbires@google.com>
Bug: 33301618

arch/arm64/configs/bullhead_defconfig

@@ -314,6 +314,7 @@ CONFIG_SERIAL_MSM_HSL=y
 CONFIG_SERIAL_MSM_HSL_CONSOLE=y
 CONFIG_SERIAL_MSM_SMD=y
 CONFIG_HW_RANDOM_MSM=y
+# CONFIG_DEVPORT is not set
 CONFIG_MSM_SMD_PKT=y
 CONFIG_MSM_ADSPRPC=y
 CONFIG_I2C=y