llext: adjust for MMU flag application

The .cold section contains executable code, while .coldrodata
contains data. Therefore their MMU flags have to be different,
particularly when mapping for userspace. Add a page-size alignment to
account for such cases.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

scripts/llext_link_helper.py

@@ -144,8 +144,7 @@ def main():
 	# critical functions in a .cold ELF section, read-only data in a
 	# .coldrodata ELF section, etc. When compiling and linking such
 	# functions, an additional .cold.literal section is automatically
-	# created. Note, that for some reason the compiler also marks .cold as
-	# executable.
+	# created.
 	# This script links those sections at address 0. We could hard-code
 	# section names, but so far we choose to only link .text the "original"
 	# way and all other executable sections we link at 0. For data sections
@@ -168,6 +167,8 @@ def main():
 
 		dram_addr += section.header['sh_size']
 
+	dram_addr = align_up(dram_addr, 0x1000)
+
 	for section in readonly_dram:
 		s_alignment = section.header['sh_addralign']
 		s_name = section.name