drivers: regulator: shell: print all 6-digits of micro values

Previously only the upper/first 3 digits of a micro value
would be printed, dropping the last 3 digits. This could cause
misleading output for cmds like vlist.

(cherry picked from commit 6c244cf)

Original-Signed-off-by: Mike J. Chen <mjchen@google.com>
GitOrigin-RevId: 6c244cf
Change-Id: I7b48a5f500e8a23f3b69f25b81b188dbf88a3dfb
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5529560
Reviewed-by: Ting Shen <phoenixshen@chromium.org>
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>
Tested-by: Ting Shen <phoenixshen@chromium.org>
Commit-Queue: Ting Shen <phoenixshen@chromium.org>

drivers/regulator/regulator_shell.c

@@ -74,8 +74,7 @@ static int strtomicro(char *inp, char units, int32_t *val)
 static void microtoshell(const struct shell *sh, char unit, int32_t val)
 {
 	if (val > 100000) {
-		shell_print(sh, "%d.%03d %c", val / 1000000,
-			    (val % 1000000) / 1000, unit);
+		shell_print(sh, "%d.%06d %c", val / 1000000, val % 1000000, unit);
 	} else if (val > 1000) {
 		shell_print(sh, "%d.%03d m%c", val / 1000, val % 1000, unit);
 	} else {