DELIA-58564: Channel Flip +/- Buttons Mapped Incorrectly

Reason for change: Youtube TV requires ch+ and Ch- keys mapped correctly.
Test Procedure: refer ticket.
Risks: None
Priority: P1
Signed-off-by: sramul630 <sunil_ramulu@comcast.com>

Change-Id: I45c5eed8e1f97bc1761ab1cc116e01d3bd722302

src/third_party/starboard/rdk/shared/linux_key_mapping.cc

diff --git a/src/third_party/starboard/rdk/shared/linux_key_mapping.cc b/src/third_party/starboard/rdk/shared/linux_key_mapping.cc
index 5c19b5f..a38adf2 100644
--- a/src/third_party/starboard/rdk/shared/linux_key_mapping.cc
+++ b/src/third_party/starboard/rdk/shared/linux_key_mapping.cc
@@ -154,8 +154,8 @@
     { KEY_1, kSbKeyModifiersCtrl, KEY_GREEN,       kSbKeyModifiersNone },
     { KEY_2, kSbKeyModifiersCtrl, KEY_YELLOW,      kSbKeyModifiersNone },
     { KEY_3, kSbKeyModifiersCtrl, KEY_BLUE,        kSbKeyModifiersNone },
-    { KEY_U, kSbKeyModifiersCtrl, KEY_CHANNELUP,   kSbKeyModifiersNone },
-    { KEY_D, kSbKeyModifiersCtrl, KEY_CHANNELDOWN, kSbKeyModifiersNone },
+    { KEY_UP, kSbKeyModifiersCtrl, KEY_CHANNELUP,   kSbKeyModifiersNone },
+    { KEY_DOWN, kSbKeyModifiersCtrl, KEY_CHANNELDOWN, kSbKeyModifiersNone },
 
     { KEY_PAGEDOWN, kSbKeyModifiersNone, KEY_NEXTSONG,   kSbKeyModifiersNone },
     { KEY_PAGEUP, kSbKeyModifiersNone, KEY_PREVIOUSSONG, kSbKeyModifiersNone },