ARM: omap2plus_defconfig: Enable ARM_KERNMEM_PERMS and few loadable modules

With recent omap assembly fixes for CONFIG_DEBUG_RODATA, we can
now use DEBUG_RODATA. Let's enable ARM_KERNMEM_PERMS so that
DEBUG_RODATA gets selected by default. This way we can make sure
any related issues are caught early.

And while testing things on various devices, I noticed we're
missing few loadable modules to make things more usable:

- USB Ethernet for smsc75xx, we only have smsc97xx right now

- Basic USB serial drivers for things like ftdi and pl2303 ports

- Blinking leds with pca963x
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/configs/omap2plus_defconfig

@@ -50,6 +50,7 @@ CONFIG_SOC_AM33XX=y
 CONFIG_SOC_AM43XX=y
 CONFIG_SOC_DRA7XX=y
 CONFIG_ARM_THUMBEE=y
+CONFIG_ARM_KERNMEM_PERMS=y
 CONFIG_ARM_ERRATA_411920=y
 CONFIG_ARM_ERRATA_430973=y
 CONFIG_SMP=y
@@ -177,6 +178,7 @@ CONFIG_TI_CPTS=y
 CONFIG_AT803X_PHY=y
 CONFIG_SMSC_PHY=y
 CONFIG_USB_USBNET=m
+CONFIG_USB_NET_SMSC75XX=m
 CONFIG_USB_NET_SMSC95XX=m
 CONFIG_USB_ALI_M5632=y
 CONFIG_USB_AN2720=y
@@ -354,6 +356,11 @@ CONFIG_USB_MUSB_DSPS=m
 CONFIG_USB_INVENTRA_DMA=y
 CONFIG_USB_TI_CPPI41_DMA=y
 CONFIG_USB_DWC3=m
+CONFIG_USB_SERIAL=m
+CONFIG_USB_SERIAL_GENERIC=y
+CONFIG_USB_SERIAL_SIMPLE=m
+CONFIG_USB_SERIAL_FTDI_SIO=m
+CONFIG_USB_SERIAL_PL2303=m
 CONFIG_USB_TEST=m
 CONFIG_AM335X_PHY_USB=y
 CONFIG_USB_GADGET=m
@@ -387,6 +394,7 @@ CONFIG_NEW_LEDS=y
 CONFIG_LEDS_CLASS=m
 CONFIG_LEDS_GPIO=m
 CONFIG_LEDS_PWM=m
+CONFIG_LEDS_PCA963X=m
 CONFIG_LEDS_TRIGGERS=y
 CONFIG_LEDS_TRIGGER_TIMER=m
 CONFIG_LEDS_TRIGGER_ONESHOT=m