Apply linker fix as in #12690 to new NUCLEO_G474RE target

Author: AGlass0fMilk

targets/TARGET_STM/TARGET_STM32G4/TARGET_STM32G474xx/TOOLCHAIN_GCC_ARM/stm32g474xx.ld

@@ -111,10 +111,7 @@ SECTIONS
     } > FLASH
     __exidx_end = .;
 
-    /* Location counter can end up 2byte aligned with narrow Thumb code but
-       __etext is assumed by startup code to be the LMA of a section in RAM
-       which must be 8-byte aligned */
-    __etext = ALIGN (8);
+    __etext = .;
     _sidata = .;
 
     .data : AT (__etext)