power: rename stpmu1 to official name stpmic1

Alignment with kernel driver name & binding
introduced by https://patchwork.kernel.org/cover/10761943/
to use the final marketing name = STPMIC1.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 147ac76..ce250cb 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -23,7 +23,7 @@
 obj-$(CONFIG_$(SPL_)PMIC_PALMAS) += palmas.o
 obj-$(CONFIG_$(SPL_)PMIC_LP873X) += lp873x.o
 obj-$(CONFIG_$(SPL_)PMIC_LP87565) += lp87565.o
-obj-$(CONFIG_PMIC_STPMU1) += stpmic1.o
+obj-$(CONFIG_PMIC_STPMIC1) += stpmic1.o
 
 obj-$(CONFIG_POWER_LTC3676) += pmic_ltc3676.o
 obj-$(CONFIG_POWER_MAX77696) += pmic_max77696.o