serial: Make full device search optional

Commit 608b0c4ad4e5ec0c ("serial: Use next serial device if probing fails")
added code to search for more serial devices if the default one was not
probed correctly.

Unfortunately, that breaks omap3_evm. So while investigating why that is
the case, let's disable the full search for everyone but bcm283x where it
is needed.

Fixes: 608b0c4ad4e5ec0c ("serial: Use next serial device if probing fails")
Reported-by: Derald D. Woods <woods.technical@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 30a6f6d..a423aa9 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -550,6 +550,7 @@
 	select DM_GPIO
 	select OF_CONTROL
 	select PL01X_SERIAL
+	select SERIAL_SEARCH_ALL
 	imply FAT_WRITE
 
 config TARGET_VEXPRESS_CA15_TC2