kernel: bump 5.15 to 5.15.48

No patches needed rebasing.

Signed-off-by: Rui Salvaterra <[email protected]>

include/kernel-5.15

@@ -1,2 +1,2 @@
-LINUX_VERSION-5.15 = .47
-LINUX_KERNEL_HASH-5.15.47 = 8b235e3aadeb5f8d5b3623b35a99179498e2f3d7f4e9457e46bd461f8496009c
+LINUX_VERSION-5.15 = .48
+LINUX_KERNEL_HASH-5.15.48 = 19f0075d1b94d6874a2af7127a59b6b6c423fc7d4a883a51415543e7ec1be2a6