[Bug Report] sfpi doesn't support shifting by register

[jasondavies]

Describe the bug

The hardware (at least Wormhole): supports shifting by register as well as immediate value. Right now, only immediate values are supported.

To Reproduce

Insert into any LLK:

vInt foo = 1;
vInt bar = 1;
foo <<= bar;

This will fail to compile with error: no match for 'operator<<=' (operand types are 'sfpi::vInt' and 'sfpi::vInt')

/home/jason/tt-metal/runtime/sfpi/include/sfpi.h:556:22: note: candidate: 'sfpi::vInt sfpi::vInt::operator<<(uint32_t)'
  556 |     sfpi_inline vInt operator<<=(uint32_t amt) { this->__vIntBase::operator<<=<vInt>(amt); return v; }
      |                      ^~~~~~~~
/home/jason/tt-metal/runtime/sfpi/include/sfpi.h:556:43: note:   no known conversion for argument 1 from 'sfpi::vInt' to 'uint32_t' {aka 'long unsigned int'}
  556 |     sfpi_inline vInt operator<<=(uint32_t amt) { this->__vIntBase::operator<<=<vInt>(amt); return v; }
      |                                  ~~~~~~~~~^~~

Expected behavior

This should compile.

Please complete the following environment information:

• Version: 2fae63e