[prim,rtl] Remove ~under_rst from the expression for fifo_incr_wptr #4493

Job	Run time
Lint (quick)	3m 9s
Airgapped build	8m 54s
Run OTBN crypto tests	2m 37s
Build documentation	4m 53s
Run OTBN smoke Test	2m 33s
Lint (slow)	12m 1s
Verible lint	1m 8s
Verilated English Breakfast	7m 33s
CW305's Bitstream	23m 30s
Verilated Earl Grey	1h 21m 26s
Build Docker Containers	2m 43s
Build and test software	13m 54s
Earl Grey for CW310 / Build bitstream	1h 47m 30s
Earl Grey for CW310 Hyperdebug / Build bitstream	1h 5m 56s
Earl Grey for CW340 / Build bitstream	1h 34m 39s
CW310 SiVal ROM_EXT Tests / FPGA test	34m 32s
CW310 Manufacturing Tests / FPGA test	28m 13s
CW310 ROM_EXT Tests / FPGA test	10m 14s
CW310 SiVal Tests / FPGA test	23m 26s
CW310 Test ROM Tests / FPGA test	5m 4s
CW310 ROM Tests / FPGA test	48m 10s
Cache bitstreams to GCP	0s
CW340 ROM Tests / FPGA test	48s
CW340 Test ROM Tests / FPGA test	3m 41s
CW340 Manufacturing Tests / FPGA test	38m 0s
CW340 ROM_EXT Tests / FPGA test	5m 33s
CW340 SiVal Tests / FPGA test	16m 44s
CW340 SiVal ROM_EXT Tests / FPGA test	4m 11s
Verify FPGA jobs	20s
	10h 51m 22s

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