mach-k3: am62ax: am62a7_init: Drop write to non existent register

Per section 14.2.1.3 Kick Protection Registers of AM62A TRM[1],
there is no partition 5. Delete it.

[1] https://www.ti.com/lit/pdf/spruj16

Fixes: b511b371ad76 ("arm: mach-k3: introduce basic files to support the am62a")
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>
diff --git a/arch/arm/mach-k3/am62ax/am62a7_init.c b/arch/arm/mach-k3/am62ax/am62a7_init.c
index ac4d300..00173e6 100644
--- a/arch/arm/mach-k3/am62ax/am62a7_init.c
+++ b/arch/arm/mach-k3/am62ax/am62a7_init.c
@@ -57,7 +57,6 @@
 	mmr_unlock(CTRL_MMR0_BASE, 1);
 	mmr_unlock(CTRL_MMR0_BASE, 2);
 	mmr_unlock(CTRL_MMR0_BASE, 4);
-	mmr_unlock(CTRL_MMR0_BASE, 5);
 	mmr_unlock(CTRL_MMR0_BASE, 6);
 
 	/* Unlock all MCU_CTRL_MMR0 module registers */