MIPS changes for 4.17

These are the main MIPS changes for 4.17. Rough overview:

 (1) generic platform: Add support for Microsemi Ocelot SoCs

 (2) crypto: Add CRC32 and CRC32C HW acceleration module

 (3) Various cleanups and misc improvements

Miscellaneous:

 - Hang more efficiently on halt/powerdown/restart

 - pm-cps: Block system suspend when a JTAG probe is present

 - Expand make help text for generic defconfigs
   - Refactor handling of legacy defconfigs

 - Determine the entry point from the ELF file header to fix microMIPS
   for certain toolchains

 - Introduce isa-rev.h for MIPS_ISA_REV and use to simplify other code

Minor cleanups:

 - DTS: boston/ci20: Unit name cleanups and correction

 - kdump: Make the default for PHYSICAL_START always 64-bit

 - Constify gpio_led in Alchemy, AR7, and TXX9

 - Silence a couple of W=1 warnings

 - Remove duplicate includes

Platform support:

ath79:

 - Fix AR724X_PLL_REG_PCIE_CONFIG offset

BCM47xx:

 - FIRMWARE: Use mac_pton() for MAC address parsing

 - Add Luxul XAP1500/XWR1750 WiFi LEDs

 - Use standard reset button for Luxul XWR-1750

BMIPS:

 - Enable CONFIG_BRCMSTB_PM in bmips_stb_defconfig for build coverage

 - Add STB PM, wake-up timer, watchdog DT nodes

Generic platform:

 - Add support for Microsemi Ocelot
   - dt-bindings: Add vendor prefix for Microsemi Corporation
   - dt-bindings: Add bindings for Microsemi SoCs
   - Add ocelot SoC & PCB123 board DTS files
   - MAINTAINERS: Add entry for Microsemi MIPS SoCs

 - Enable crc32-mips on r6 configs

Octeon:

 - Drop '.' after newlines in printk calls

ralink:

 - pci-mt7621: Enable PCIe on MT7688
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