[RISCV] Remove duplicate WriteRes<WriteJalr for MIPSP8700. (#123865)

We had two WriteRes for WriteJalr with difference latencies. Drop the
duplicate and change the latency of Jal to 1 based on review feedback

Author: topperc

llvm/lib/Target/RISCV/RISCVSchedMIPSP8700.td

@@ -125,11 +125,8 @@ def : WriteRes<WriteCSR, [p8700ALQ]>;
 
 // Handle CTI Pipeline.
 def : WriteRes<WriteJmp, [p8700IssueCTI]>;
-def : WriteRes<WriteJalr, [p8700IssueCTI]>;
-let Latency = 2 in {
 def : WriteRes<WriteJal, [p8700IssueCTI]>;
 def : WriteRes<WriteJalr, [p8700IssueCTI]>;
-}
 
 // Handle FPU Pipelines.
 def p8700FPQ : ProcResource<3> { let BufferSize = 16; }