Merge "health 2.0: update readme to uninstall healthd" into pi-dev

Upgrading from health@1.0 HAL

0. Remove android.hardware.health@1.0* from PRDOUCT_PACKAGES

0. Remove android.hardware.health@1.0* from PRODUCT_PACKAGES

   in device/<manufacturer>/<device>/device.mk

1. If the device does not have a vendor-specific libhealthd AND does not

   implement storage-related APIs, just add the following to PRODUCT_PACKAGES:

   android.hardware.health@2.0-service

   implement storage-related APIs, just do the following:

    1.1 (recommended) To remove healthd from the build,

        PRODUCT_PACKAGES += android.hardware.health@2.0-service.override

        DEVICE_FRAMEWORK_MANIFEST_FILE += \

            system/libhidl/vintfdata/manifest_healthd_exclude.xml

    1.2 To keep healthd in the build,

        PRODUCT_PACKAGES += android.hardware.health@2.0-service

   Otherwise, continue to Step 2.

2. Create directory

    ],

    header_libs: ["libhealthd_headers"],

    // Uncomment the following to remove healthd from the build.

    // overrides: [

    //     "healthd",

    // ],

}

    3.1 (recommended) To remove healthd from the build, keep "overrides"

          section, and include the following in device.mk:

            DEVICE_FRAMEWORK_MANIFEST_FILE += \

                system/libhidl/vintfdata/manifest_healthd_exclude.xml

    3.2 To keep healthd in the build, remove "overrides" section.

4. Create device/<manufacturer>/<device>/health/android.hardware.health@2.0-service.<device>.rc

service vendor.health-hal-2-0 /vendor/bin/hw/android.hardware.health@2.0-service.<device>