[sw] Complete S1 Review for UART DIF

Closes #1386.

Signed-off-by: Sam Elliott <selliott@lowrisc.org>
diff --git a/hw/ip/uart/data/uart.prj.hjson b/hw/ip/uart/data/uart.prj.hjson
index 61640a0..ee99a35 100644
--- a/hw/ip/uart/data/uart.prj.hjson
+++ b/hw/ip/uart/data/uart.prj.hjson
@@ -22,7 +22,7 @@
         life_stage:         "L1",
         design_stage:       "D2",
         verification_stage: "V2",
-        dif_stage:          "S0",
+        dif_stage:          "S1",
         notes:              "Rolled back to D2 as the register module is updated"
       }
     ]
diff --git a/sw/device/lib/dif/dif_uart.md b/sw/device/lib/dif/dif_uart.md
index 0ae89d8..f8f63eb 100644
--- a/sw/device/lib/dif/dif_uart.md
+++ b/sw/device/lib/dif/dif_uart.md
@@ -9,12 +9,12 @@
 
 Type           | Item                 | Resolution  | Note/Collaterals
 ---------------|----------------------|-------------|------------------
-Implementation | [DIF_EXISTS][]       | Not Started |
-Implementation | [DIF_USED_IN_TREE][] | Not Started |
-Tests          | [DIF_TEST_UNIT][]    | Not Started |
-Tests          | [DIF_TEST_SANITY][]  | Not Started |
-Review         | Reviewer(s)          | Not Started |
-Review         | Signoff date         | Not Started |
+Implementation | [DIF_EXISTS][]       | Done        |
+Implementation | [DIF_USED_IN_TREE][] | Done        |
+Tests          | [DIF_TEST_UNIT][]    | Done        |
+Tests          | [DIF_TEST_SANITY][]  | Done        |
+Review         | Reviewer(s)          | Done        | @gkelly @lenary @silvestrst
+Review         | Signoff date         | Done        | 2020-07-14
 
 [DIF_EXISTS]:       {{< relref "/doc/project/checklist.md#dif-exists" >}}
 [DIF_USED_IN_TREE]: {{< relref "/doc/project/checklist.md#dif-used-in-tree" >}}