stm32mp1: remove the second TAMP_BOOT_CONTEXT update

The register TAMP_BOOT_CONTEXT is already updated in
get_bootmode() in cpu.c and no need to be done
twice.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

arch/arm/mach-stm32mp/spl.c

@@ -14,9 +14,6 @@ u32 spl_boot_device(void)
 
 	boot_mode = (readl(TAMP_BOOT_CONTEXT) & TAMP_BOOT_MODE_MASK) >>
 		    TAMP_BOOT_MODE_SHIFT;
-	clrsetbits_le32(TAMP_BOOT_CONTEXT,
-			TAMP_BOOT_MODE_MASK,
-			boot_mode << TAMP_BOOT_MODE_SHIFT);
 
 	switch (boot_mode) {
 	case BOOT_FLASH_SD_1: