pru-icss_git.bb: bug fixes, add PRU_ADC

PRU Software Support Package v5.2.1 integrates 3 bug fixes and adds am335x
PRU_ADC example. PRU Software Support Package tags were updated so that v5.2.0
corresponds to the release that will be pulled into Linux SDK 5.0, while v5.2.1
corresponds to the commit for this version of the bitbake.

Signed-off-by: Nick Saulnier <nsaulnier@ti.com>
Signed-off-by: Denys Dmytriyenko <denys@ti.com>

recipes-bsp/pru/pru-icss_git.bb

@@ -8,9 +8,9 @@ inherit update-alternatives
 
 BRANCH = "master"
 SRC_URI = "git://git.ti.com/pru-software-support-package/pru-software-support-package.git;protocol=git;branch=${BRANCH}"
-SRCREV = "df1d9da2047385fdd27e8735af31000dfdcf7625"
+SRCREV = "81b568741b8b98e6f590271a9aea5956d2b2d9ce"
 
-PV = "5.2.0"
+PV = "5.2.1"
 PR = "r1"
 
 require recipes-ti/includes/ti-paths.inc