CODEOWNERS: rename nrf52_bsim to nrf5x_bsim

Rename nrf52_bsim to nrf5x_bsim to match with change due to
added nrf53_bsim.

Signed-off-by: Aurora Sletnes Bjørlo <[email protected]>

Author: auroraslb

CODEOWNERS

@@ -129,7 +129,7 @@
 /boards/nios2/altera_max10/               @nashif
 /boards/arm/stm32_min_dev/                @cbsiddharth
 /boards/posix/                            @aescolar @daor-oti
-/boards/posix/nrf52_bsim/                 @aescolar @wopu-ot
+/boards/posix/nrf5x_bsim/                 @aescolar @wopu-ot
 /boards/riscv/                            @kgugala @pgielda
 /boards/riscv/rv32m1_vega/                @MaureenHelm
 /boards/shields/                          @erwango