GPIO and UART seem similar across STMicro product matrix,
so renamed files accordingly. RCC is cloned just in case,
while conflicting differences there seem to be very minor.

This is modeled after STM32F7. Idea is to declare each chip in Kconfig
but allow for flash size override. Commit adds many STM32L4_HAVE_XXX
feature test macros.

This reverts commit 1e054a2d.

Merged in david_s5/nuttx-15/david_s5/fixed-typo-and-backward-ifdef-1493853031502 (pull request #345)

Fixed typo and backward ifdef

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Signed-off-by: Juha Niskanen <juha.niskanen@haltian.com>

Signed-off-by: Juha Niskanen <juha.niskanen@haltian.com>

OPAMP support for STM32F33XX

Signed-off-by: Juha Niskanen <juha.niskanen@haltian.com>

binfmt: Fix offset value when calling elf_read() in elf_sectname()

Approved-by: Gregory Nutt <gnutt@nuttx.org>

pthread: Fix compilation error on pthread_cond_wait when CONFIG_CANCELLATION_POINTS and CONFIG_PTHREAD_MUTEX_UNSAFE are enabled.