arm: ti: Remove omap4 platform support

There are no longer any OMAP4 platforms in U-Boot, remove the related
functionality.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 34b0211..cba7f84 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -771,7 +771,7 @@
 	int "Max I2C busses"
 	depends on ARCH_OMAP2PLUS || ARCH_SOCFPGA
 	default 3 if OMAP34XX || AM33XX || AM43XX
-	default 4 if ARCH_SOCFPGA || OMAP44XX
+	default 4 if ARCH_SOCFPGA
 	default 5 if OMAP54XX
 	help
 	  Define the maximum number of available I2C buses.