package/esp-hosted: fix legal-info

The esp-hosted package was introduced in [1] defining the variable
ESP_HOSTED_LICENSE_FILE (singular). The name should be
ESP_HOSTED_LICENSE_FILES (plural). This typo makes the license file
being ignored during a "make legal-info" which shows a warning at
the end:

    WARNING: esp-hosted-9a2312b0b: cannot save license (ESP_HOSTED_LICENSE_FILES not defined)

Fixing the variable name also reveals the license file path was
incorrect. The "esp_hosted_ng/host/" directory prefix is missing.
Finally, setting the correct path shows the hash was wrong (it was
the hash of the Apache-2.0 [2] file, which corresponds to another
unused code portion). So the license file hash is also changed to
correspond to the correct GPL-2.0 license file.

This commit fixes all the needed esp-hosted legal-info.

[1] https://gitlab.com/buildroot.org/buildroot/-/commit/7b2e5e6550aed4f79461919c6a59e00741eb4b11
[2] https://github.com/espressif/esp-hosted/blob/release/ng-v1.0.4.0.0/LICENSES/Apache-2.0

Cc: Giulio Benetti <giulio.benetti@benettiengineering.com>
Reviewed-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/esp-hosted/esp-hosted.hash

@@ -1,3 +1,3 @@
 # Locally calculated
 sha256  66c07e2f69d8a10fb111b6df27fbe3558734d660207a54391c46eea3e12b29ee  esp-hosted-9a2312b0b2630e41bacb3091faaba489cb43b0ab.tar.gz
-sha256  ed57d96d27be775b22f9571d3724ef84e0d0b8f24b805ec7f87a32189de19a9c  LICENSE
+sha256  f6b78c087c3ebdf0f3c13415070dd480a3f35d8fc76f3d02180a407c1c812f79  esp_hosted_ng/host/LICENSE

package/esp-hosted/esp-hosted.mk

@@ -8,7 +8,7 @@ ESP_HOSTED_VERSION = 9a2312b0b2630e41bacb3091faaba489cb43b0ab
 ESP_HOSTED_SITE = $(call github,espressif,esp-hosted,$(ESP_HOSTED_VERSION))
 ESP_HOSTED_DEPENDENCIES = linux
 ESP_HOSTED_LICENSE = GPL-2.0
-ESP_HOSTED_LICENSE_FILE = LICENSE
+ESP_HOSTED_LICENSE_FILES = esp_hosted_ng/host/LICENSE
 ESP_HOSTED_MODULE_SUBDIRS = esp_hosted_ng/host
 
 define ESP_HOSTED_LINUX_CONFIG_FIXUPS