I have manually removed the single bit PLLSRC under RCC_CFGR register, and I have manually updated the `enum/PLLSRC` to have 3 variants to match the bit_size of PLLSRC.
I have manually removed the single bit PLLSRC under RCC_CFGR register, and I have manually updated the `enum/PLLSRC` to have 3 variants to match the bit_size of PLLSRC.