add yuv420p2rgb type for ncnn::Mat::from_pixels_resize

[miluof]

调用函数ncnn::Mat::from_pixels_resize时，增加了类型PIXEL_YUV420P2RGB和PIXEL_YUV420P2BGR，实际过程是调用了已有函数yuv420sp2rgb，增加了yuv420p2yuv420sp，将yuv420p转成yuv420sp。 写了一个测试例子在examples目录下，叫yuv2rgbresize.cpp

[codecov-commenter]

Codecov Report

Merging #2149 into master will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2149      +/-   ##
==========================================
- Coverage   86.46%   86.45%   -0.01%     
==========================================
  Files         508      508              
  Lines       82955    82961       +6     
==========================================
  Hits        71723    71723              
- Misses      11232    11238       +6     

Impacted Files	Coverage Δ
src/mat.h	84.91% <ø> (ø)
src/mat_pixel.cpp	55.87% <0.00%> (-0.27%)	:arrow_down:
src/mat_pixel_resize.cpp	98.84% <ø> (ø)

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[miluof]

封装resize_bilinear_yuv420p和yuv420p2rgb

[nihui]

不要用中文注释，修正代码格式 非关键代码不建议使用移位操作替代乘除法 测试代码写在 tests/test_mat_pixels 里面

[miluof]

OK

------------------ 原始邮件 ------------------ 发件人: "nihui"<[email protected]>; 发送时间: 2020年9月25日(星期五) 下午4:15 收件人: "Tencent/ncnn"<[email protected]>; 抄送: "miluo"<[email protected]>; "Author"<[email protected]>; 主题: Re: [Tencent/ncnn] add yuv420p2rgb type for ncnn::Mat::from_pixels_resize (#2149)

不要用中文注释，修正代码格式 非关键代码不建议使用移位操作替代乘除法 测试代码写在 tests/test_mat_pixels 里面

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[miluof]

删掉了中文注释，删掉了例子程序，已在本地验证yuv转rgb。

[lgtm-com[bot]]

This pull request introduces 2 alerts and fixes 26 when merging a84d8aec0f4236a702487890ac8e670b7c9d6136 into 7b5b829143ac2696a242ebab3eaa9272b310e28b - view on LGTM.com

new alerts:

• 2 for Multiplication result converted to larger type

fixed alerts:

• 10 for Missing header guard
• 10 for Multiplication result converted to larger type
• 5 for FIXME comment
• 1 for Comparison result is always the same

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[miluof]

增加删掉上次增加的没有用的函数，只保留ncnn::Mat::from_pixels_resize使用PIXEL_YUV420SP2RGB和PIXEL_YUV420SP2BRG转换数据，