ext: silabs: rename ramfunc section to match Zephyr's

Functions which have to be located in RAM are placed by SiLabs library
code in section '.ram'. Corresponding section used by Zephyr is called
'.ramfunc'. This patch renames SiLabs naming to match Zephyr's.

This solution was chosen over adding '.ram' function to Zephyr linker
scripts not to pollute them. However, this patch needs to be reapplied
every time SiLabs library version is updated.

Fixes #13192

Signed-off-by: Piotr Mienkowski <piotr.mienkowski@gmail.com>

ext/hal/silabs/gecko/emlib/inc/em_ramfunc.h

diff --git a/ext/hal/silabs/gecko/emlib/inc/em_ramfunc.h b/ext/hal/silabs/gecko/emlib/inc/em_ramfunc.h
index a483490..6601e92 100644
--- a/ext/hal/silabs/gecko/emlib/inc/em_ramfunc.h
+++ b/ext/hal/silabs/gecko/emlib/inc/em_ramfunc.h
@@ -143,7 +143,7 @@
 
 #elif defined(__GNUC__)
 /* Simplicity Studio, Atollic and Vanilla armgcc */
-#define SL_RAMFUNC_DECLARATOR          __attribute__ ((section(".ram")))
+#define SL_RAMFUNC_DECLARATOR          __attribute__ ((section(".ramfunc")))
 #define SL_RAMFUNC_DEFINITION_BEGIN    SL_RAMFUNC_DECLARATOR
 #define SL_RAMFUNC_DEFINITION_END