net: ipa: add IPA v5.0 to ipa_version_string()

In the IPA device sysfs directory, the "version" file can be read to
find out what IPA version is implemented.  The content of this file
is supplied by ipa_version_string(), which needs to be updated to
properly handle IPA v5.0.

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230322144742.2203947-1-elder@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Alex Elder

drivers/net/ipa/ipa_sysfs.c

@@ -36,6 +36,8 @@ static const char *ipa_version_string(struct ipa *ipa)
 		return "4.9";
 	case IPA_VERSION_4_11:
 		return "4.11";
+	case IPA_VERSION_5_0:
+		return "5.0";
 	default:
 		return "0.0";	/* Won't happen (checked at probe time) */
 	}