cortexm: add support for DWTv2 so that watchpoints work on Armv8-M (m… #777

Job	Run time
build-linux (ubuntu-22.04, jammy, clang-13)	37s
build-linux (ubuntu-22.04, jammy, clang-18)	39s
build-linux (ubuntu-22.04, jammy, gcc-11)	34s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, 96b_carbon)	33s
build-linux (ubuntu-22.04, jammy, gcc-13)	5m 42s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, blackpill-f401cc)	27s
build-macos (macos-13)	39s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, blackpill-f401ce)	31s
build-macos (macos-14)	26s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, blackpill-f411ce)	35s
build-mingw (windows-2022, ucrt64)	1m 44s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, bluepill)	33s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, ctxlink)	35s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, f072)	27s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, f3)	34s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, f4discovery)	34s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, hydrabus)	26s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, launchpad-icdi)	28s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native)	32s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native-uncommon)	32s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native-st-clones)	41s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native-riscv)	25s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native-remote)	28s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, stlink)	25s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, stlinkv3)	26s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, swlink)	30s
package-firmware	0s
	20m 3s

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