[RISCV] Make zve32f imply F and zve64d imply D.

The 1.0 vector spec PDF has text that says that Zve32f is compatible
with F or Zfinx and that Zve64d is compatible with D and Zdinx.
The references to *inx were removed from the spec in the github repository in
October 2021. The 1.0 pdf was made in September 2021.

Relevant commit https://github.com/riscv/riscv-v-spec/commit/6fedb869e213da03f36092d661d14911a2f9d2c6

Reviewed By: jacquesguan

Differential Revision: https://reviews.llvm.org/D150021