Re-arrange condition logic from the last change to avoid having STM32-specific conditional logic outside of the STM32 sandbox.

STM32:  Add driver for STM32L162XX AES peripheral. Signed-off-by: Juha Niskanen <juha.niskanen@haltian.com>

Also remove spaces before and after paretheses to conform to coding standard.

drivers/ramdisk.c and include/nuttx/fs/ramdisk.h:  Add logic to dispose of the drvier and RAM buffer when the RAM disk has been unlinked and all open references to the RAM disk have been closed.  Add new parameters to romdisk() to specify what should be done with the RAM/ROM buffer -- Should it be freed or not?  Changed all calls to ramdisk() to use these new parameters.

EFM32: Logic to unconditionally enable LE clocking. Even you don't use core clock LE as source for LFA or LFB, to read are write any register not clocked by HFPERCLK or HFCORECLK, HFCORECLKLE should be enabled.  From Pierre-noel Bouteville.

ARM assembly language memcpy.S was not returning a value in R0 it is required to do.  From David Sidrane

Tiva Ethernet:  Move place where interrupts are disabled.  It is probably not possible, but the logic looks like it could leave interrupts disabled

Recent changes to stm32_rtcc.c do not compile with STM32L15XX configurations.  From Jussi Kivilinna.

Disabling any of EXTI 5-9 interrupts was disabling interrupts for all EXTI 5-9. Same issue with EXTI 10-15.  From Jussi Kivilinna.

Get USART 2 & 3 working on lpc4357-evb. These changes are required to get USART 2 and 3 working on the Embest development board.  From Toby Duckworth

First step at porting to MoteinoMEGA.  LED shows assert failure at boot.  Appears to be short double blink, short off (~1sec), followed by 250ms toggle cycles.  Most of it derived from amber board.

Remove CONFIG_DEBUG_STACK.  Adding CONFIG_STACK_COLORATION makes this configuration option pointless

Add CONFIG_STACK_COLORATION that does the same thing as CONFIG_DEBUG_STACK but without enabling debug.  From David Sidrane

Armv7-M: Remove Px4-only setting of stack to 0xff.  This is incompatible with standard NuttX stack montitoring logic

Armv7-M: Remove Px4-only setting of stack to 0xff.  This is incompatible with standard NuttX stack montitoring logic

All Ethernet drivers (again):  Missed one place where arp_out() is called and neighber_out() needs to be called

Networking:  Modify all Ethernet drivers:  Do neighbor look-up on all outgoing IPv6 packs in order to properly set the destination link layer address.