RISC-V Fixes for 5.7-rc4

This tag contains a handful of fixes that I'd like to target for 5.7.
Specifically:

* The change of a linker argument to allow linking with lld.
* A build fix for configurations without a frame pointer.
* A handful of build fixes related the SBI 0.1 vs 0.2 split.
* The removal of STRICT_KERNEL_RWX for !MMU, which isn't useful
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