clock: Add new type ssystime_t for relative 64-bit ticks, change ticks<->time conversion functions to use ssystime_t

Add clock_resynchronize for better synchronization of CLOCK_REALTIME and CLOCK_MONOTONIC to match RTC after resume from low-power state.

Add up_rtc_getdatetime_with_subseconds under CONFIG_ARCH_HAVE_RTC_SUBSECONDS to allow initializing (and resynchronizing) system clock with subseconds accuracy RTC.

Move net/iob to drivers/iob so that the I/O buffering feature can be available to other drivers when networking is disabled.

procfs: Fix wrong member IDs are displayed when 'cat /proc/<pid>/group/stasus'.

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

Add support for STM32L152CC, STM32L152RC and STM32L152VC.  Update some bits and comments for other STM32L1 parts in chip.h

STM32 L1: stm32l15xx_rcc: Allow board to configure HSE clock in bypass-mode.  Allows using MCO output from ST-link chip (on Nucleo and Discovery boards) as HSE input.

Jira: PDFW15IS-259
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

SAMV7 EMAC:  Add conditional logic to account the fact that the SAMV71 has 6 rather than 3 queues after version 1.

stm32:stm32_serial fixed warning

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

Kinetis:Fixed warning

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

STM32F0:  The STM32F2 does not have use alternate function groupings as does the F1.  Rather, it is like other members of the STM32 family with An alternate setting AF0-AF7 for each pin.

Move: CONFIG_ADC_NO_START_CONV from drivers/adc/Kconfig to arch/arm/src/stm32[f7]/Kconfig as STM32[F7]_ADC_NO_START_CONV.  Refresh all configurations with any reference to CONFIG_ADC_NO_START_CONV.