stpmic1: add NVM update support in fuse command

Add functions to read/update the non volatile memory of STPMIC1
(8 bytes-register at 0xF8 address) and allow access
with fuse command (bank=1, word > 0xF8).

For example:

STM32MP> fuse read 1 0xf8 8
Reading bank 1:

Word 0x000000f8: 000000ee 00000092 000000c0 00000002
Word 0x000000fc: 000000f2 00000080 00000002 00000033

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/include/power/stpmic1.h b/include/power/stpmic1.h
index ea91b75..0e6721d 100644
--- a/include/power/stpmic1.h
+++ b/include/power/stpmic1.h
@@ -107,4 +107,11 @@
 	STPMIC1_PWR_SW2,
 	STPMIC1_MAX_PWR_SW,
 };
+
+int stpmic1_shadow_read_byte(u8 addr, u8 *buf);
+int stpmic1_shadow_write_byte(u8 addr, u8 *buf);
+int stpmic1_nvm_read_byte(u8 addr, u8 *buf);
+int stpmic1_nvm_write_byte(u8 addr, u8 *buf);
+int stpmic1_nvm_read_all(u8 *buf, int buf_len);
+int stpmic1_nvm_write_all(u8 *buf, int buf_len);
 #endif