doc: software_maturity: fast_pair: update status for nRF54L15

Updated the software maturity levels in the Google Fast Pair category
for the nRF54L15 device to declare the "Supported" level for the locator
tag use case and its feature depedencies.

Ref: NCSDK-29887

Signed-off-by: Kamil Piszczek <[email protected]>
(cherry picked from commit 968215e)

Author: kapi-no

doc/nrf/releases_and_maturity/software_maturity.rst

@@ -1454,7 +1454,7 @@ The following table indicates the software maturity levels of the support for Go
         - Supported
         - Experimental
         - --
-        - Experimental
+        - Supported
         - --
         - --
         - --
@@ -1494,7 +1494,7 @@ The following table indicates the software maturity levels of the support for ea
         - Supported
         - Experimental
         - --
-        - Experimental
+        - Supported
         - --
         - --
         - --
@@ -1550,7 +1550,7 @@ The following table indicates the software maturity levels of the support for ea
         - Supported
         - Experimental
         - --
-        - Experimental
+        - Supported
         - --
         - --
         - --