LSE MAX_WAIT feature

[nmschulte]

An extended RTCSEL macro set to attempt LSE oscillator for RTCSEL through a timeout, falling back to regular RTCSEL set otherwise.

ChibiOS v20:

• original rusEFI patch: bfbf88e
• stable_20.3.x.FOME: more LSE WAIT_MAX things #7 -- FOME-ize names, more STM32 ports, warnings, fixes, and backup domain reset fix
  • FOME-ize names: 7d40419
  • backup domain reset fix: c8a1ee6
  • macro use warnings: 22692f1
  • H7 correction: 579d5d4

ChibiOS v21:

• LSE max wait patches #1 -- port v20 to v21
  • ported, original rusEFI patch: 7ed8236
  • FOME-ize names: 12c805f
• stable_21.11.x.FOME: backup domain reset re: FOME_STM32_LSE_MAX_WAIT #2 -- backup domain reset fix
  • backup domain reset fix: bbf0c3e
• stable_21.11.x.FOME: add ChibiOS FOME_STM32_LSE_WAIT_MAX macro warnings #3 -- warnings
  • macro use warnings: 5dccd81

[nmschulte]

• rusEFI PR to use the feature (ChibiOS v20): enable LSE (via: LSE max wait patches) rusefi/rusefi#4944
• rusEFI issue re: RTC, driving the need: RTC and SD logs (seems to work only on F7 at the moment) rusefi/rusefi#4556
• rusEFI changes to address issues w/ the feature as it stands:
  • Running RTC from LSE can possibly hang ECU rusefi/rusefi#7278
  • 4556 RTC: switch from LSI to LSE if present rusefi/rusefi#7272
  • RTC fixup for STM32F4 rusefi/rusefi#7279
  • RTC: fixup LSI to LSE switch for f4 rusefi/rusefi#7299