Update linker script to match upper bound (#345)

firmware/targets/f4/stm32wb55xx_flash_cm4.ld

@@ -55,7 +55,7 @@ _Min_Stack_Size = 0x1000; /* required amount of stack */
 /* Specify the memory areas */
 MEMORY
 {
-FLASH (rx)                 : ORIGIN = 0x08000000, LENGTH = 512K
+FLASH (rx)                 : ORIGIN = 0x08000000, LENGTH = 780K
 RAM1 (xrw)                 : ORIGIN = 0x20000004, LENGTH = 0x2FFFC
 RAM_SHARED (xrw)           : ORIGIN = 0x20030000, LENGTH = 10K
 }

firmware/targets/f4/stm32wb55xx_flash_cm4_boot.ld

@@ -55,7 +55,7 @@ _Min_Stack_Size = 0x1000; /* required amount of stack */
 /* Specify the memory areas */
 MEMORY
 {
-FLASH (rx)                 : ORIGIN = 0x08008000, LENGTH = 480K
+FLASH (rx)                 : ORIGIN = 0x08008000, LENGTH = 780K
 RAM1 (xrw)                 : ORIGIN = 0x20000004, LENGTH = 0x2FFFC
 RAM_SHARED (xrw)           : ORIGIN = 0x20030000, LENGTH = 10K
 }

firmware/targets/f4/stm32wb55xx_flash_cm4_no_boot.ld

@@ -55,7 +55,7 @@ _Min_Stack_Size = 0x400; /* required amount of stack */
 /* Specify the memory areas */
 MEMORY
 {
-FLASH (rx)                 : ORIGIN = 0x08000000, LENGTH = 512K
+FLASH (rx)                 : ORIGIN = 0x08000000, LENGTH = 812K
 RAM1 (xrw)                 : ORIGIN = 0x20000004, LENGTH = 0x2FFFC
 RAM_SHARED (xrw)           : ORIGIN = 0x20030000, LENGTH = 10K
 }