modlib: Implement sh_addralign handling

I've seen a module with 16 bytes .rodata alignment for xmm operations.
It was getting SEGV on sim/Linux because of the alignment issue.
The same module binary seems working fine after applying this patch.

Also, tested on sim/macOS and esp32 on qemu,
using a module with an artificially large alignment. (64 bytes)

include/nuttx/arch.h

@@ -730,15 +730,15 @@ void up_module_text_init(void);
 #endif
 
 /****************************************************************************
- * Name: up_module_text_alloc
+ * Name: up_module_text_memalign
  *
  * Description:
- *   Allocate memory for module text.
+ *   Allocate memory for module text with the specified alignment.
  *
  ****************************************************************************/
 
 #if defined(CONFIG_ARCH_USE_MODULE_TEXT)
-FAR void *up_module_text_alloc(size_t size);
+FAR void *up_module_text_memalign(size_t align, size_t size);
 #endif
 
 /****************************************************************************

include/nuttx/lib/modlib.h

@@ -198,6 +198,8 @@ struct mod_loadinfo_s
   uintptr_t         datastart;   /* Start of.bss/.data memory in .text allocation */
   size_t            textsize;    /* Size of the module .text memory allocation */
   size_t            datasize;    /* Size of the module .bss/.data memory allocation */
+  size_t            textalign;   /* Necessary alignment of .text */
+  size_t            dataalign;   /* Necessary alignment of .bss/.text */
   off_t             filelen;     /* Length of the entire module file */
   Elf_Ehdr          ehdr;        /* Buffered module file header */
   FAR Elf_Shdr     *shdr;        /* Buffered module section headers */