EDAC: Use string choice helper functions

Remove hard-coded strings by using the str_enabled_disabled(), str_yes_no(),
str_write_read(), and str_plural() helper functions.

Add a space in "All DIMMs support ECC: yes/no" to improve readability.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Reviewed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Link: https://lore.kernel.org/r/20250223212429.3466-2-thorsten.blum@linux.dev