arm: Remove flea3 board

This board has not been converted to CONFIG_DM by the deadline.
Remove it.  As this is the last mx35 platform, remove that support as
well.

Cc: Stefano Babic <sbabic@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index ce977bf..6c9a00c 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -111,7 +111,7 @@
 libs-y += arch/arm/lib/
 
 ifeq ($(CONFIG_SPL_BUILD),y)
-ifneq (,$(CONFIG_MX23)$(CONFIG_MX28)$(CONFIG_MX35)$(filter $(SOC), mx25 mx5 mx6 mx7 mx35 imx8m imx8 imx8ulp imxrt))
+ifneq (,$(CONFIG_MX23)$(CONFIG_MX28)$(filter $(SOC), mx25 mx5 mx6 mx7 mx35 imx8m imx8 imx8ulp imxrt))
 libs-y += arch/arm/mach-imx/
 endif
 else