fs/resctrl: Add boiler plate for external resctrl code

Add Makefile and Kconfig for fs/resctrl. Add ARCH_HAS_CPU_RESCTRL
for the common parts of the resctrl interface and make X86_CPU_RESCTRL
select this.

Adding an include of asm/resctrl.h to linux/resctrl.h allows the
/fs/resctrl files to switch over to using this header instead.

Co-developed-by: Dave Martin <[email protected]>
Signed-off-by: Dave Martin <[email protected]>
Signed-off-by: James Morse <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Reviewed-by: Shaopeng Tan <[email protected]>
Reviewed-by: Tony Luck <[email protected]>
Reviewed-by: Fenghua Yu <[email protected]>
Reviewed-by: Reinette Chatre <[email protected]>
Tested-by: Fenghua Yu <[email protected]>
Tested-by: Carl Worth <[email protected]> # arm64
Tested-by: Shaopeng Tan <[email protected]>
Tested-by: Peter Newman <[email protected]>
Tested-by: Amit Singh Tomar <[email protected]> # arm64
Tested-by: Shanker Donthineni <[email protected]> # arm64
Tested-by: Babu Moger <[email protected]>
Tested-by: Tony Luck <[email protected]>
Link: https://lore.kernel.org/[email protected]

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