MAINTAINERS: Add Google Bluey and Qualcomm SOC maintainers

This commit updates the MAINTAINERS file to reflect active
maintenance for the Google Bluey mainboard and Qualcomm SOCs.

Specifically:
- A new section `GOOGLE BLUEY MAINBOARDS` is added, assigning
  Subrata Banik and Kapil Porwal as maintainers for
  `src/mainboard/google/bluey/`. This is for the newly
  supported Bluey platform.

- A new section `QUALCOMM SOCS` is added, assigning Subrata
  Banik and Kapil Porwal as maintainers for `src/soc/qualcomm/`.
  Consequently, `src/soc/qualcomm/` is removed from the
  `ORPHANED ARM SOCS` section. This establishes active support
  for Qualcomm SOCs within coreboot.

Change-Id: I355fcf7a7c6c865a1cc3c405d5f8d03747b2d9fc
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87645
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

MAINTAINERS

@@ -329,7 +329,10 @@ M:	Angel Pons <th3fanbus@gmail.com>
 S:	Maintained
 F:	src/mainboard/gigabyte/ga-h61m-series/
 
-
+GOOGLE BLUEY MAINBOARDS
+M:	Subrata Banik <subratabanik@google.com>
+M:	Kapil Porwal <kapilporwal@google.com>
+F:	src/mainboard/google/bluey/
 
 GOOGLE REX MAINBOARDS
 M:	Subrata Banik <subratabanik@google.com>
@@ -977,11 +980,15 @@ S:	Maintained
 F:	src/soc/mediatek/mt8192/
 F:	src/vendorcode/mediatek/mt8192/
 
+QUALCOMM SOCS
+M:	Subrata Banik <subratabanik@google.com>
+M:	Kapil Porwal <kapilporwal@google.com>
+F:	src/soc/qualcomm/
+
 ORPHANED ARM SOCS
 S:	Orphan
 F:	src/cpu/armltd/
 F:	src/soc/ti/
-F:	src/soc/qualcomm/
 F:	src/soc/samsung/
 F:	util/exynos/
 F:	util/ipqheader/