net: network drver now retains Ethernet MAC address in a union so that other link layer addresses may be used in a MULTILINK environment.

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>