Misoc LM32: Corrects a bug that never occured in qemu on simulation or real fpga. The error was that the r1 register was being modified out of context switching and not restoring it.

Patch brings strtol() and related functions more conformant with POSIX.  Corner cases like strtol(-2147483648, NULL, 10) now pass clang -fsanitize=integer without warnings.

typos

Change the way to configure quadrature encoder prescalers.

sem_wait() and sem_trywait() no longer modify the errno value UNLESS an error occurs.  This allows these functions to be used internallly without clobbering the errno value.

LM32: Move interrupt definitions from common irq.h to lm32/irq.h.  Remove unused misoc_uart.c and .h

STM37xx PWM:  Add PWM driver support for STMF37xx.  The changes have been tested successfuly for TIM4 and TIM17 (different IPs).

STM32F7 SD/MMC driver depends on CONFIG_SDIO_DMA which is only defined in stm32/Kconfig.  Changed to CONFIG_STM32F7_SDMMC_DMA and defined in stm32f7/Kconfig.

stm32f7 important usb fixes

LM32: Correct some assembly language interrupt handling issues.  Now the basic port seems functional.