machine/esp32, targets/esp32: correct board definitions for actual boards not processor variants, also define all labeled pins

Signed-off-by: deadprogram <ron@hybridgroup.com>

targets/esp32-coreboard-v2.json

@@ -0,0 +1,4 @@
+{
+	"inherits": ["esp32"],
+	"build-tags": ["esp32_coreboard_v2"]
+}

targets/esp32-mini32.json

@@ -0,0 +1,3 @@
+{
+	"inherits": ["esp32-coreboard-v2"]
+}

targets/esp32-wroom-32.json

@@ -1,4 +0,0 @@
-{
-	"inherits": ["esp32"],
-	"build-tags": ["esp32_wroom_32"]
-}