rp2040: Renamed pw_sys_io_rp2040

Change-Id: Ib7dec3625ad4194cbc06334900de7415e30a9693
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/174912
Reviewed-by: Armando Montanez <amontanez@google.com>
Commit-Queue: Anthony DiGirolamo <tonymd@google.com>
diff --git a/targets/rp2040/BUILD.gn b/targets/rp2040/BUILD.gn
index c70c715..2d7a944 100644
--- a/targets/rp2040/BUILD.gn
+++ b/targets/rp2040/BUILD.gn
@@ -72,7 +72,7 @@
     pw_unit_test_MAIN = "$dir_pigweed/targets/rp2040:pico_logging_test_main"
     pw_assert_BACKEND = dir_pw_assert_basic
     pw_log_BACKEND = dir_pw_log_basic
-    pw_sys_io_BACKEND = dir_pw_sys_io_pico
+    pw_sys_io_BACKEND = dir_pw_sys_io_rp2040
 
     pw_chrono_SYSTEM_CLOCK_BACKEND = "$dir_pw_chrono_freertos:system_clock"
     pw_interrupt_CONTEXT_BACKEND = "$dir_pw_interrupt_cortex_m:context_armv7m"
diff --git a/third_party/pigweed b/third_party/pigweed
index b5d9901..7bffcc0 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit b5d99012ee4c59bc2850e227de85f6317c65e8d0
+Subproject commit 7bffcc0fce846849e04ad6f58a7e84fd287f94d4